Data Sheet
HY[B/E]18M1G16[0/1]BF
1-Gbit DDR Mobile-RAM
2.4.10
POWER-DOWN
Power-down is entered when CKE is registered LOW (no
accesses can be in progress). If power-down occurs when all
banks are idle, this mode is referred to as precharge power-
down; if power-down occurs when there is a row active in any
bank, this mode is referred to as active power-down. Entering
power-down deactivates the input and output buffers,
excluding CK, CK and CKE. In power-down mode, CKE LOW
must be maintained, and all other input signals are “Don’t
Care”. The minimum power-down duration is specified by
FIGURE 37
Power-Down Entry Command
CK
CK
CKE
t
CKE. However, power-down duration is limited by the refresh
CS
requirements of the device.
RAS
CAS
WE
The power-down state is synchronously exited when CKE is
registered HIGH (along with
a NOP or DESELECT
command). A valid command may be applied tXP after exit
from power-down.
A0-A12
BA0,BA1
= Don't Care
FIGURE 38
Power-Down Entry and Exit
#+
#+
T20
T#+%
T80
#+%
#OMMAND
!DDRESS
02%
./0
./0
./0
6ALID
6ALID
6ALID
!ꢂꢀ ꢅ!0ꢇ
$1
0RE !LL
(IGHꢆ:
0OWER $OWN
%NTRY
%XIT FROM
0OWER $OWN
!NY
#OMMAND
0RECHARGE 0OWER $OWN MODE SHOWNꢈ ALL BANKS ARE IDLE AND T20 MET
WHEN 0OWER $OWN %NTRY #OMMAND IS ISSUED
ꢁ $ONgT #ARE
Rev.1.0, 2007-03
10242006-Y557-TZXW
45
QIMONDA [ QIMONDA AG ]
